It’s either Gran Turismo 5 or Final Fantasy X. GT5 I probably put over a thousand hours into in the process of getting the platinum. I probably spent over a hundred hours just on the Vettel challenges alone. FFX (the ps2 version) I have have 2 separate perfect save files. The grind to getting a perfect sphere grid in that game is insane. Unfortunately I no longer have the memory card that had the save files but I’m pretty sure I put over a thousand hours into it.